clicking on the directory name between two adjacent slashes on location bar jumps into the directory being clicked, clicking on whitespace on location bar enter into edit mode. this will help a lot while people are in a very deep directory. Reproducible: Always
This is actually already possible, although poorly documented (I didn't know it was possible until I started going through the code): while you are editing the line (the caret is in there), you can CTRL+Click on a parent folder to go directly there. This is probably not a good way to implement this functionality as other software does it differently, but given that it IS possible I would rather focus on other bugs/wishes first.
*** This bug has been marked as a duplicate of bug 315355 ***